Within the framework of EUROMET Project No. 308, a set of five metallic wires of diameters between 0,05 mm and 1 mm was circulated and calibrated by the national metrology institutes of the United Kingdom, Switzerland, Germany and France. Diametral measurements were made in the middle of each wire in four different directions approximately 45 apart with the aim of assessing variations in diameter. No special measurement procedure was prescribed: each participating laboratory had to follow its own measurement procedure. The comparison reflects the state-of-the-art for small external diameter measurement in the Western European national metrology institutes.
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